Abrasive finishing disk



April 23, 1963v P. s. HARDY ABRASIVE FINISHING DISK Filed March 29, 1960 INVENToR.

PETER 5. HARDY z 79S BY Smw-emmw\ h-f' qui i y A`// fa a /a ATT/JRNEY United States Patent 3,086,277 ABRASIVE FINISHING DISK Peter S. Hardy, Trumbull, Conn., assignor to Peerless Aluminum Foundry Co., Inc., Bridgeport, Conn., a corporation of Connecticut Filed Mar. 29, 1960, Ser. No. 18,299 4 Claims. (Cl. 29-78) The present invention relates to -an abrasive iinishing disk, particularly for the finishing of metal parts such as aluminum castings and the like, and has for an object to provide a tinishing disk in which the abrasive surface comprises a plurality of iiles which may be conveniently replaced when Worn, or for the purpose of substituting tiles having different tile patterns. Another object is to provide a iinishing disk in which a plurality of iile members are arranged in a novel manner to present their le surfaces to the work in a manner to perform the nishing operation with a high degree of speed, efficiency and quality of iinish. In particular it is proposed to arrange the plurality of file members in circumferential succession with their longitudinal axes tangential to a concentric circular line of the disk whereby as successive tile members move in relation to the work they are presented at constantly changing angles. A further object is to provide a finishing disk in which a plurality of iile members are arranged with their abrasive surfaces in raised relation to the face of the disk and in such spaced relation to each other that clearance spaces are provided about the edges of each of the iile members to constantly scavenge led particles from the tile members.

Other objects and advantages will become apparent from a consideration of the following detailed description taken in connection with the accompanying draw-- ings wherein a satisfactory embodiment of the invention is shown. However, it will be understood that the invention is not limited to the details disclosed but includes all such variations and modiiications as fall within the spirit of the invention and the scope of the appended claims.

In the drawings:

FIG. l is a front elevation of an abrasive iinishing disk according to the invention;

FIG. 2 is a side elevation showing the disk mounted in a linishing machine;

FIG. 3 is a sectional View on an enlarged scale taken along the line 3--3 of FIG. l;

FIGS. 4, 5 and 6 are fragmentary sectional views, similar to the left hand end portion of lFIG. 3, and showing modiiied forms of file members;

FIG. 7 is a front elevation partially broken away of a finishing disk according to a modification of the invention;

FIG. 8 is a sectional view yon an enlarged scale taken along the line 8-8 of FIG. 7.

Referring to the drawings the finishing disk, according to the embodiment of the invention illustrated in FIGS. `1-3, comprises a circular disk body 10 adapted to be secured by screws Y1-1 in centered relation upon the face plate 12 of a conventional finishing machine as shown in FIG. 2, the hub 13 of the face plate being mounted upon the shaft 114 of an electric motor 15 mounted upon a base 16, and upon which there is also mounted for tilting adjustment a work supporting table 17 upon which the Work may be supported -in engagement with the abrasive surface of the iinishing disk. While the disk body is shown as a separate member secured to the `face plate :12, it will be understood that it may replace the conventional face plate, in which case it is provided with a central hub similar tothe hub 13 for direct mounting upon the motor shaft 14.

`In the forward face of the disk body 10 there are provided a plurality of straight parallel sided channels 18 equally spaced circumferentially with their longitudinal axes tan-gential to a concentric circular line of the disk lying between its center and its periphery. The inner end of each channel is closely adjacent to the side of the next adjacent channel and the outer end opens to the periphery of the disk body. Within each channel there is engaged an elongated rectangular .tile member 19 having its parallel sides in engagement with the side walls of the channel, its inner end substantially in abutment with the inner end wall of the channel, and its outer end adjacent and inwardly of the outer periphery of the disk body. As seen in lFIG. 3 the abrasive surfaces of tile teeth 20 at the upper side of the iile are outwardly offset from the face of the disk body y10.

Each tile is retained in its respective channel by a pair of dlat head screws 21-21 engaged in beveled conntersink holes 22 in the tile and screwed into threaded holes 23-23 in the disk body, the ilat head surfaces of the screws being countersunk below the abrasive surfaces of the iile teeth. The file members are conveniently engaged with or disengaged from the channels by longitudinally sliding them into or out of engagement through the open ends of the channels.

As shown in FIG. l, eight tile members are provided and the outer side edge of each file member is at an angle of 45 to the inner side edge of the adjacent file member, the angle of 45 representing the quotient of 360 divided by 8. It will :be understood that a greater or less number of tile members may be provided in the same -tangential relation to a concentric circular line of the disk, for example, as shown in FIG. 7 six tile members are provided, each of which is at an angle of 60 to the adjacent iile members. In the latter case the iile members cover a greater expanse of the disk, their inner ends being closer to the center than in the case of the eight tile members as seen in FIG. l.

In operation the disk may be rotated in either clockwise or counter-clockwise direction and as the successive file members engage the work they constantly change their relative angle to the work resulting in a rapid and Very smooth iinishing operation. An important feature of the invention is the successive spaced arrangement of the file members, each having a relatively small abrasive surface surrounded by the downwardly offset face surface of the disk body, and which results in the constant scavenging of the filed particles from between the file teeth, these particles being dispersed through the clearance spaces provided about the file members by the downwardly otiset face of the disk body.

In FIG. 4 there is shown a modication in which the iile member 19a is provided with iile teeth 20 upon both surfaces, thus enabling the file member to be inverted in the channel to expose the teeth at either side. The teeth may be of the same type at each side or they may be of different type, for instance, coarse at the one Side and fine at the other. In this case the screw receiving hole 24 is beveled from each side, so that the beveled head of the screw 21 will seat therein in either position of the file member.

In FIG. 5 there is shown a modification in which the le member 19'b having file teeth 20 at one side is provided with outwardly beveled sides 2S for sliding interlocking engagement with inwardly beveled side walls 26 of the channel 13.

In FIG. 6 a iile member 19C having file teeth 20 at both sides and a screw receiving hole 24 beveled from both sides is provided with double beveled sides 27 for sliding interlocking engagement with correspondingly beveled side walls 28 of the channel 18. Obviously equivalent '3 sliding interlocking formations may be employed, as for instance tongues and grooves.

In the case of the file member having sliding interlocking engagement in the channels as seen in FIGS. 5 and 6, the file members may be retained against longitudinal movement in the channels either by one or more screws engaged through holes in the iile members as seen in FIGS. 5 and 6, or they may be retained as seen in FG. 7 by locking cap screws 29 screwed in the outer ends of the channels with their heads in abutting relation to the outer ends of the le members, the abutment of the inner ends of the tile members with the inner end walls of the channels preventing longitudinal movement of the lile members in one direction and the locking screws 29 preventing longitudinal movement in the other direction.

What is claimed is:

1. In an abrasive finishing disk, a disk body having a plurality of elongated channels in its face side having parallel outer and inner side walls, an inner end wall, and an outer end opening to the periphery of said disk, said channels being arranged in equally spaced circumferentially successive relation with their longitudinal axes tangential to a concentric circular line of said disk body with the inner end wall of each channel opposite to the inner side wall of the next adjacent channel at a point between the outer and inner ends of said next adjacent channel, and the degree angle relation between the outer side wall of each channel and the inner side wall of the next adjacent channel being the quotient of 360 divided by the number of channels, and a le member having parallel outer and inner side edges and outer and inner end edges secured in each said channel with its abrasive surface outwardly offset from the disk face to provide clearance spaces in surrounding relation to the respective file members, each said file member being of a width whereby its side edges engage the side walls of its re spective channel and of a length whereby its inner end edge abuts 4the inner end wall of said respective channel and its outer end edge is inwardly of the periphery of said disk body.

2. In an abrasive finishing disk, a disk body having a plurality of elongated channels in its face side having parallel outer and inner side walls, an inner end wall, and an outer end opening to the periphery of said disk, said channels being arranged in equally spaced circumferentially successive relation with their longitudinal axes A tangential to a concentric circular line of said disk body with the inner end wall of each channel opposite to the inner side wall of the nextadjacent channel at a point between the outer and inner ends of said next adjacent channel, and the degree angle relation between the outer side Wall of each channel and the inner side wall of the next adjacent channel being the quotient of 360 divided by the number of channels, a file member having parallel outer and inner side edges and outer and inner end edges engaged in each said channel with its abrasive surface outwardly offset from the disk face to provide clearance spaces in surrounding relation to the respective file members, each said ile member being of a width whereby its side edges engage the side walls of its respective channel and of a length whereby its inner end edge abuts the inner end wall of said respective channel and its outer end edge is inwardly of the periphery of said disk body, the parallel side edges of each said file member and the parallel side walls of its respective channel having cooperative surfaces for longitudinal sliding and interlocking engagement to retain said file member against removal from said channel in a direction perpendicular to its base while permitting insertion and removal through A.the open outer end of said channel, and removable means for securing each said file member against longitudinal outward movement in its respective channel.

3. The mvention as deiined in claim 2, further characterized in that said removable means is engaged in the base of each said channel in abutting relation with the outer end edge of the respective file member in said channel.

4. The invention as defined in claim 2, wherein said le members have abrasive surfaces at both faces and are invertible to expose either face and wherein said cooperative surfaces have sliding and interlocking engagement in either position of said tile members.

References Cited in the le of this patent UNITED STATES PATENTS 438,270 Johnson Oct. 14, 1890 1,284,092 Gray Nov. 5, 1918 1,851,613 Albee Mar. 29, 1932 2,034,277 Albee Mar. 17, 1936 2,214,954 Crater Sept. 17, 1940 

1. IN AN ABRASIVE FINISHING DISK, A DISK BODY HAVING A PLURALITY OF ELONGATED CHANNELS IN ITS FACE SIDE HAVING PARALLEL OUTER AND INNER SIDE WALLS, AN INNER END WALL, AND AN OUTER END OPENING TO THE PERIPHERY OF SAID DISK, SAID CHANNELS BEING ARRANGED IN EQUALLY SPACED CIRCUMFERENTIALLY SUCCESSIVE RELATION WITH THEIR LONGITUDINAL AXES TANGENTIAL TO A CONCENTRIC CIRCULAR LINE OF SAID DISK BODY WITH THE INNER END WALL OF EACH CHANNEL OPPOSITE TO THE INNER SIDE WALL OF THE NEXT ADJACENT CHANNEL AT A POINT BETWEEN THE OUTER AND INNER ENDS OF SAID NEXT ADJACENT CHANNEL, AND THE DEGREE ANGLE RELATION BETWEEN THE OUTER SIDE WALL OF EACH CHANNEL AND THE INNER SIDE WALL OF THE NEXT ADJACENT CHANNEL BEING THE QUOTIENT OF 360* DIVIDED BY THE NUMBER OF CHANNELS, AND A FILE MEMBER HAVING PARALLEL OUTER AND INNER SIDE EDGES AND OUTER AND INNER END EDGES SECURED IN EACH SAID CHANNEL WITH ITS ABRASIVE SURFACE OUTWARDLY OFFSET FROM THE DISK FACE TO PROVIDE CLEARANCE SPACES IN SURROUNDING RELATION TO THE RESPECTIVE FILE MEMBERS, EACH SAID FILE MEMBER BEING OF A WIDTH WHEREBY ITS SIDE EDGES ENGAGE THE SIDE WALLS OF ITS RESPECTIVE CHANNEL AND OF A LENGTH WHEREBY ITS INNER END EDGE ABUTS THE INNER END WALL OF SAID RESPECTIVE CHANNEL AND ITS OUTER END EDGE IS INWARDLY OF THE PERIPHERY OF SAID DISK BODY. 